New features

• Issue #2979963 by mferanda: Add column/row span ability for cells (also fixed an undefined field bug with initial html display)
• Issue #2979248 by mferanda: ag-Grid does not work in IE 11 and config entity should be more open for admin (xss::filteradmin)
• Issue #2977972#2977972 by mferanda: Allow changes to default after initial creation

Issue #2980397 by Ronald van Belzen: Create interfaces for the Lexer and Degenerator classes
Issue #2980305 by Ronald van Belzen: Send mail notifications for new unapproved comments

Better implementation of Custom Map positioning, with Center and Zoom (default and forced) settings,
both for Leaflet Field formatter and Leaflet Views.
Issue #2762903 by PhilippVerpoort, GreenSkunk, joco_sp: Add zoom settings to Views
Note: Existing Leaflet Field formatter settings will be kept for rendering, but would be re-set in the Manage display settings in the edit process.

- Update timeout

Drupal Standard changes

Add example of each saved configuration so that we can see how to get value (s) of saved configuration.